Troy got out to a 10-0 lead at halftime then held on to a last-ditch comeback by LSU en route to a shocking 24-21 win over the Tigers on the road in Baton Rouge.
The questions grew larger over LSU's future after the Tigers fell to 3-2 before the halfway mark of the season. LSU earlier got manhandled by Mississippi State 37-7 in its SEC opener; the Tigers' three wins came over BYU (27-0), Chattanooga (45-10) and Syracuse (35-26).
The last time LSU lost at home to a non-conference opponent was in 2000 to UAB.
Troy quarterback Brandon Silvers got the Trojans on the board first with a 1-yard touchdown rush to go up 7-0 at the 13:13 mark of the first quarter.